|Publication number||US7644050 B2|
|Application number||US 11/002,833|
|Publication date||Jan 5, 2010|
|Filing date||Dec 2, 2004|
|Priority date||Dec 2, 2004|
|Also published as||US7752299, US20060123017, US20080270403|
|Publication number||002833, 11002833, US 7644050 B2, US 7644050B2, US-B2-7644050, US7644050 B2, US7644050B2|
|Inventors||Daniel Christopher Berg, Narinder Makin, Lawrence Scott Rich, Ritchard Leonard Schacher|
|Original Assignee||International Business Machines Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (15), Non-Patent Citations (4), Referenced by (5), Classifications (5), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention is related to the following applications: Method and Apparatus for Incrementally Processing Program Annotations, Ser. No. 11/002,845, filed on Dec. 2, 2004; Mechanism for Defining Queries in Terms of Data Objects Background of the Invention, Ser. No. 11/002,740, filed on Dec. 2, 2004; and Method and System for Generating an SDO Based Service Pattern for an EJB Model, Ser. No. 11/001,864, filed on Dec. 2, 2004. All of the above related applications are assigned to the same assignee, and incorporated herein by reference.
1. Technical Field
The present invention relates to an improved data processing system. In particular, the present invention relates to contributing resources of program annotations in a data processing system. Still more particularly, the present invention relates to extending annotation-based behavior to multiple annotation resources.
2. Description of Related Art
In modern development environments, programmers may use annotations declared in a source program to generate auxiliary artifacts or files that perform services. Many common artifacts, including home and remote interfaces and deployment descriptors of an enterprise Java™ Bean, can be automatically generated by an integrated development environment (IDE), a deployment tool, or a batch script using annotations.
In most development environments, an annotation is a comment declared in a source program that is preceded with a ‘@’ symbol. By using annotations, meta-data may be associated with program elements such as classes, methods, fields, parameters, local variables, and packages. For some programming languages, annotations are compiled and the metadata is stored in the class files. For other programming languages, annotations are interpreted and processed by an annotation processor. Later, the virtual machine or other programs can look for the metadata to determine how to interact with the program elements or change their behavior.
Currently, existing development tools that support annotation processing and artifacts generation, such as Ant, an open source product available from Apache Software Foundation, and XDoclet, an open source product available from the XDoclet team of the Apache Software Foundation, requires annotations to be self contained in a contributing resource from which the generated code is derived. This means that generally only one source file may be used for generation of one or more distinct compatible source files. However, there are a few exceptions, for example, using the XDoclet enterprise JavaBeans™ tag specification to support generation of enterprise Java™ beans, many source files contribute meta-data to the “ejb-jar.xml” deployment descriptor file. The J2EE enterprise JavaBeans™ specification is a product available from Sun Microsystems, Inc. The XDoclet enterprise JavaBeans™ tag specification specifies the ‘ejb’ annotation tagset that may be use to generate enterprise Java™ beans.
In this case, the output file is well known, static, and not arbitrarily or dynamically declared by the contributing files. Moreover, its name and structure are predefined and not extensible. In other words, one or more distinct source files are generated from the annotations in each annotated source file, and the meta-data from all annotated source files is combined into the deployment descriptor file.
In a common tag specification, an annotation in a source file may describe a generated file and subsequent annotations within the same source file may contribute behavior to this generated file. However, annotations from other source files may not be used to contribute behavior to this generated file.
Thus, current annotation-based models are limited to a single annotated source file for behavior contributions of a given generated file. This causes an explosion in the number of generated files, since a source file may contribute behavior to one or more generated files, but only one source file may be used to generate each generated file. This explosion leads to a complex application architecture devoid of logically partitioning or grouping of behavior in the generated files, driven by a higher number of generated files. All of which is undesirable by developers.
Therefore, it would be advantageous to have an improved method and apparatus that allows annotation-based behavior to be contributed from multiple annotated source files into a single set of generated related files, such that the behavior of the generated output can be more appropriately partitioned based on the business model, and potentially reducing the number of generated files, in order to provide a more flexible application architecture.
A method, apparatus and computer instructions is provided for annotation-based behavior extensions. The mechanism of the present invention allows behaviors to be contributed from annotations in multiple source files into a single output file or a set of related output files. The names and locations of the output files are dynamically derived from the values specified in the annotations. The mechanism of the present invention allows for the identification of a primary contributor based on a first attribute in a first source file and examines a secondary contributor of a second attribute in a second source file. If the value of the first attribute matches the value of the second attribute, the mechanism of the present invention generates one or more files with linked behaviors from the primary contributor and the secondary contributor.
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein:
With reference now to the figures,
In the depicted example, server 104 is connected to network 102 along with storage unit 106. In addition, clients 108, 110, and 112 are connected to network 102. These clients 108, 110, and 112 may be, for example, personal computers or network computers. In the depicted example, server 104 provides data, such as boot files, operating system images, and applications to clients 108-112. Clients 108, 110, and 112 are clients to server 104. Network data processing system 100 may include additional servers, clients, and other devices not shown. In the depicted example, network data processing system 100 is the Internet with network 102 representing a worldwide collection of networks and gateways that use the Transmission Control Protocol/Internet Protocol (TCP/IP) suite of protocols to communicate with one another. At the heart of the Internet is a backbone of high-speed data communication lines between major nodes or host computers, consisting of thousands of commercial, government, educational and other computer systems that route data and messages. Of course, network data processing system 100 also may be implemented as a number of different types of networks, such as for example, an intranet, a local area network (LAN), or a wide area network (WAN).
Peripheral component interconnect (PCI) bus bridge 214 connected to I/O bus 212 provides an interface to PCI local bus 216. A number of modems may be connected to PCI local bus 216. Typical PCI bus implementations will support four PCI expansion slots or add-in connectors. Communications links to clients 108-112 in
Additional PCI bus bridges 222 and 224 provide interfaces for additional PCI local buses 226 and 228, from which additional modems or network adapters may be supported. In this manner, data processing system 200 allows connections to multiple network computers. A memory-mapped graphics adapter 230 and hard disk 232 may also be connected to I/O bus 212 as depicted, either directly or indirectly.
Those of ordinary skill in the art will appreciate that the hardware depicted in
The data processing system depicted in
With reference now to
An operating system runs on processor 302 and is used to coordinate and provide control of various components within data processing system 300 in
Those of ordinary skill in the art will appreciate that the hardware in
As another example, data processing system 300 may be a stand-alone system configured to be bootable without relying on some type of network communication interfaces. As a further example, data processing system 300 may be a personal digital assistant (PDA) device, which is configured with ROM and/or flash ROM in order to provide non-volatile memory for storing operating system files and/or user-generated data.
The depicted example in
The present invention provides a method, apparatus and computer instructions for annotation-based behavior extensions. For a given tag specification, the mechanism of the present invention identifies a primary contributor. A primary contributor is an annotation in a given source file that has a ‘name’ attribute. However, an attribute other than ‘name’ may also be used to identify the annotation. The ‘name’ attribute uniquely identifies that specific annotation contribution across the entire module. A module is a collection of related source files that compose an application, for example, the enterprise JavaBeans™ specification includes a collection of source files related to an “ejb module”, contained within an application defined by the Java™ 2 enterprise edition specification.
Using the mechanism of the present invention, behavior contributions to the primary contributor may be specified by other annotations defined in the same source file or other source files. The present invention links behavior contributions from other source files by matching the values of a ‘match’ attribute in annotations of the other source files with the value of the ‘name’ attribute of the primary contributor. The use of the attribute name ‘match’ is arbitrary and an attribute with a name other than ‘match’ may also be used to link the behavior contribution back to the primary contributor. The annotation with the ‘match’ attribute may reside in the same source file, a different source file, or in multiple source files.
For example, a ‘name’ attribute with a value of ‘ServiceFacade’ is defined in a primary contributor named ‘session-facade’. When an annotation with the same tag name in a different source file is encountered, the mechanism of the present invention determines whether the value of its ‘match’ attribute matches the value of the ‘name’ attribute. In this example, the mechanism of the present invention determines if the ‘match’ attribute also has a value of ‘ServiceFacade’.
If the value matches, this annotation is identified as a secondary contributor and the mechanism of the present invention links the behavior contribution of the secondary contributor to the primary contributor. Thus, when annotations are processed, the single generated file or the set of generated related files not only includes behavior contributed from the primary contributor, but also the behavior of the secondary contributor, which can be an annotation from a different source file.
Behavior of the secondary contributor includes metadata resulting in the generation of fields, operations, classes, or other serializable media identified by the secondary contributor. Similarly, additional behavior contributions from other annotations of other source files may be linked to the primary contributor using the ‘match’ attribute or any other desired attribute. Linking includes behaviors from additional contributions to the primary contributor in generation of one or more output files.
Turning now to
In annotation-based model 400, one or more annotations may be defined in source file 1, since annotations may exist in different levels of source file 1. The attributes in each of these annotations contains meta information that is used to derive or generate a set of output files, output files 1 to N 404.
Similarly, annotations defined in source file 2 may be used to generate a second set of output files, output files 1 to N 408. As shown in
However, source file 1 may not contribute to generation of the second set of output files 408 and source file 2 may not contribute to the generation of the first set of output files 404. This limitation restricts the flexibility of the architecture and can result in a large number of output files, since contribution of each output file is limited to a single source file.
Turning now to
In this example, source file 1, source file 2, and source file 3 all contribute meta-data to deployment descriptor file 410. An example of a deployment descriptor file 410 is ‘ejb-jar.xml’ file in the enterprise JavaBean™ specification. The enterprise JavaBean™ specification and the Java™ 2 enterprise edition specification are products available from Sun Microsystems, Inc.
However, deployment descriptor file 410 is typically defined in a well known or static location as defined by the specification. In other words, the name and structure of the deployment description file 410 are predefined and are not extensible. Thus, each of the source files contributes to the deployment descriptor file, but not to defined output files that are shared dynamically.
Turning now to
Within each source file, annotations may be defined to specify artifacts or behaviors to be generated at run time. When a user initiates a build in the IDE, annotation processor 522 processes source files 520 by parsing the annotations within a changed source file and calls registered annotation tag handlers 524 based on the namespace of the annotations. Each of the registered annotation tag handlers 524 corresponds to a particular namespace or tag set.
When annotation tag handler 524 receives a request to process changes, it initiates recording of changes using an annotation change recorder. Annotation tag handler 524 then retrieves or creates a modeled source element, such as a source type, field, or method, in source model 526. Source model 526 represents actual Java™ types, fields or methods.
Annotation tag handler 524 also creates or updates doclet model object in doclet model 528 for the given annotation tag and associates the doclet model object with the modeled source element. Doclet model 528 includes doclet objects that are either created or updated by annotation tag handlers 526 during processing of annotations. Doclet objects represent valid annotation tags and associated attributes for a type, field, or method of a given namespace.
Once all changed source files are processed, annotation tag handler 526 notifies the annotation change recorder to stop recording and determines if any changes are made to doclet model 528. If changes are made, annotation tag handler 526 invokes an annotation model transformer to transform each added, removed, and changed doclet object into semantic model 530. The transformation is performed using a content model handler, which iterates each added, removed, and changed doclet object and records the changes to semantic objects in semantic model 530 accordingly.
Turning now to
Using the mechanism of the present invention, such as element 522 and 524 in
As shown in the example illustrated in
Also shown in
However, unlike output file P1, output file P2 has a third contribution, annotation S3P2 in source file C. Annotation S3P2 is the tertiary contribution to output file P2. In addition to annotation S3P2, source file C includes annotation P3, which is the only contribution to output file P3. Hence, annotation P3 is the primary contribution to output file P3.
The examples in
Turning now to
Type 710 defines a tag name for the annotation. The tag name is unique for a particular namespace, but may not be unique across different namespaces. For example, the ‘ejb’ namespace may include a ‘home’ type, which defines a home interface for the enterprise Java bean.
In this example, annotation 702 is a primary contributor. Primary contributor 702 defines the basis for artifact or file generation. It includes a ‘name’ attribute 712, which is a named attribute that uniquely identifies an instance of annotation 702 across the entire module. The ‘name’ attribute 712 provides a key for other contributions to reference annotation 702 by its name. Value 714 defines a unique value for ‘name’ attribute 712. An example ‘value’ may be ‘ServiceFacade’.
Annotation 704 is a secondary contributor. Annotation 704 defines additional state and behavior to be appended to the generated artifacts or files. Instead of a ‘name’ attribute, secondary contributor 704 includes ‘match’ attribute 716, which is a named attribute used to reference primary contributor 702.
In order to link the behavior of secondary contributor 704 to primary contributor 702, value 718 of ‘match’ attribute 716 matches the unique value 714 of key ‘name’ attribute 712 of primary contributor 702. From the above example, value 718 must be ‘ServiceFacade’.
Turning now to
RegistrationBean.java 802 includes annotation 804, which has a namespace of ‘ws.sbf’ and a type of ‘session-facade’. In addition, annotation 804 includes a ‘name’ attribute with a value of ‘ServiceFacade’. Annotation 804 also includes a ‘value-objects’ attribute with a value of ‘Registration’, which indicates that the “Registration” value object is to be managed by the generated artifact, such as the ServiceFacade bean. Turning now to
AddressBean.java 820 includes annotation 822, which also has a namespace of ‘ws.sbf’ and a type of ‘session-facade’. In addition, annotation 822 includes a ‘match’ attribute with a value of ‘ServiceFacade’. Annotation 822 also includes a ‘value-objects’ attribute with a value of ‘Address’, which indicates that the “Address” value object is also to be managed by the same generated facade artifact ‘ServiceFacade’.
Thus, when AddressBean.java 820 is processed, the mechanism of the present invention recognizes that the value of ‘ServiceFacade’ matches the ‘name’ attribute from primary contributor annotation 804 in
Turning now to
In this example, not only behavior contributions from RegistrationBean.java 802 in
Furthermore, contributions from
RegistrationBean 802 and AddressBean 820 may be interleaved to form a generated method. For example, createMediatorMetaData method 916 is formed with createRegistrationRootMediatorMetaData method 918 from RegistrationBean 802 in
Turning now to
As depicted in
Next, a determination is made by the mechanism of the present invention as to whether a ‘name’ attribute exists (step 1008). If a ‘name’ attribute exists, the mechanism of the present invention creates a primary contributor object (step 1011) and links the behavior of matched secondary contributions to this primary contribution object (step 1012). The process then continues to step 1014.
However, if a ‘name’ attribute does not exist, the mechanism of the present invention determines if a ‘match’ attribute exists (step 1009). If a ‘match’ attribute exists, the mechanism of the present invention links behavior of this annotation to the primary contribution object (step 1010) and the process continues to step 1014. Otherwise, the mechanism of the present invention generates exceptions (step 1013) and the process continues to step 1014.
At step 1014, a determination is made by the mechanism of the present invention as to whether additional extendible annotations exist in this source file. If additional extendible annotations exist in this source file, the process returns to step 1004 to retrieve the next extendible annotation in this source file. Otherwise, the mechanism of the present invention determines as to whether additional source files exist (step 1016).
If additional source files exist, the process returns to step 1002 to retrieve the next source file. Otherwise, artifacts or files are generated with all behaviors combined from all linked annotations (step 1018). Thus, the process terminates thereafter.
In summary, the present invention allows behavior to be contributed from multiple source files into a single output file or a set of related output files. The mechanism of the present invention matches the value of a ‘name’ attribute of an annotation in a source file against the value of a ‘match’ attribute of an annotation in another source file to determine whether behaviors should be included from a secondary contributor when generating artifacts. In this way, the limitation of a single annotated source file is eliminated and a more flexible application architecture may be constructed without this limitation.
It is important to note that while the present invention has been described in the context of a fully functioning data processing system, those of ordinary skill in the art will appreciate that the processes of the present invention are capable of being distributed in the form of a computer readable medium of instructions and a variety of forms and that the present invention applies equally regardless of the particular type of signal bearing media actually used to carry out the distribution. Examples of computer readable media include recordable-type media, such as a floppy disk, a hard disk drive, a RAM, CD-ROMs, DVD-ROMs, and transmission-type media, such as digital and analog communications links, wired or wireless communications links using transmission forms, such as, for example, radio frequency and light wave transmissions. The computer readable media may take the form of coded formats that are decoded for actual use in a particular data processing system.
The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention, the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
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|U.S. Classification||706/18, 703/19|
|International Classification||G06E3/00, G06E1/00|
|Jan 24, 2005||AS||Assignment|
Owner name: INTERNATIONAL BUSINESS MACHINES CORPORATION, NEW Y
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BERG, DANIEL CHRISTOPHER;MAKIN, NARINDER;RICH, LAWRENCE SCOTT;AND OTHERS;REEL/FRAME:015618/0145
Effective date: 20041112
|Nov 16, 2010||CC||Certificate of correction|
|Aug 16, 2013||REMI||Maintenance fee reminder mailed|
|Jan 5, 2014||LAPS||Lapse for failure to pay maintenance fees|
|Feb 25, 2014||FP||Expired due to failure to pay maintenance fee|
Effective date: 20140105